Improvement in driving-power for locomotives



nitdi Seite WILLIAM D. ARNET'I, DENVER, COLORADO TERRITORY.

Letters Patent No. 111,603, dated February 7, 1871.

IMPROVEMENT IN DRIVING-POWER FOR LQCOMOTIVES.

The Schedule referred to in the Letters Patent and making part of the same.

To all whom it muy concern:

Be it'known that I, WILLIAM D. ARNE'rT, of Denver, in the county of Arapahoe and Territory of Oolorado, have invented a new and improved Dn'ving- Power for Locomotives; and I doherehy declare that the following is a full, clear, and exact description thereof, reference being had to the -accompanying drawing making part of this specification, in which- Figure 1, plate 1, .is a side elevation of a locomotive-carriage having my invention applied to its wheels.

Figure 2, plate 1, is a longitudinal section through the same.

` Figure 3, plate 2, is a top view of tig. 1.

Similar letters of reference indicate corresponding parts in the several gures. l

This invention relates -to an arrangement of the steam-cylinders, the pitman-rods, and cranks upon the frame of a locomotive, whereby the power is more equally and advantageously distributed to the drivingwheels than hitherto.

The following description of my invention willena- I ble others skilled in the art to understand it and carry it into eiect.

The frame A ofthe locomotive may be constructed in the usual well-known manner, and the drivingwheels O O' applied thereto in a Imanner which is well understood by builders. l

At or near each end of this frame A a cylinder-bed, G, is applied, on which two steam-cylinders are applied, which may receive steam from'the boiler in any suitable manner.

The piston-rods a a of the rear cylinders B B are connected to pitman-rods b b, which extend forward, and are applied to wrist-pinsfiI t' on the surfaces of two spur-wheels 'D D.

The wheels D D are keyed on the endsof crank` shaft, S,- having two cranks h h, to which the pitman-rods a' a. of piston-rods g g are connected.

' The piston-rods g gare applied to pistons B' B at or nearthe front end of frame A.

The points of attachment of the pitman-rods lf b and a' a' are so arranged relatively to each other that the shaft S is taken hold of and power applied to it by the four cylinders at four points, in a circle or at `quarter strokes, so that, practically,the shaft S has four cranks, which are equidistant from the axis of said shaft.

The spur-wheels D D engage with the teeth of spur-wheels D' D', which are keyed on the end of the axles of the front drivers C O. ,'lhus motion is transmitted from the cra'nk-shaftS to said drivers.

The wheels C O communicate rotary motion to the rear drivers O C through the medium of two connecting-rods c c, which are applied toVwrist-pins j j on spur-wheels D' D', and to wrist-pins jjon the wheels C C..

The wrist-pins on wheels D' D C O have the same length of strokes as the wrist-pins i t and cranks h h, so that all the wheels rotate at\ the same degree ot' speed.

The wrist-pins jj and j' j are so, relatively to one another and to the wrist-pins t' t and cranks hh, that there are four impulses on-each side ofthe frame A,-

operating at different points of a circle to propel fthe carriage; that is to say, by dividing a circle intoA eight equidis'tant points, and distributingthese points as described, 'we have the arrangement above descrihed.

By thisarrangernent the locomotive will not act against itself nor against traction, the forward pressure is counterbalanced by the backward pressure, and

power is applied uniformlyto the crank-shaft; hence,

it will be seen that there is a very rapid application vof' the propelling impulses to the wheels, which will greatly assist in ascending, grades, as well as in the propulsion generally.

If desirable, the spur-wheels may be located inside of the frame A; but I prefer to have'them outside thereof, for convenience of access and repairs. Having described my invention, What I claim as new, and desire to secure by Letters Patent, is

The relative arrangementof the-wrist-pi'ns 'i jj'j" and cranks h h., in'combination with the connectingrods, the spur-wheels D D', and steam-cylinders B B', substantially as described, and-*for the purposes set forth.

WILLIAM D.- ARNET'I.

Witnesses WM. RAYMOND M. L. Home. 

